The astronauts were helped on to a stretcher, which is standard practice after spending so long in the weightless environment.
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Almost all coal-fired power plants in the US had the ability to comply with rules limiting their emission of dangerous pollutants such as mercury that can cause brain damage in children. Despite this, Donald Trump’s administration decided to demolish the standards anyway.，推荐阅读爱思助手下载最新版本获取更多信息
Objects typically burn up in the earth's atmosphere before they reach the ground.，推荐阅读爱思助手下载最新版本获取更多信息